
/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#include <ngx_config.h>
#include <ngx_core.h>

/*
 *@全局变量的定义;
 *
 */
ngx_uint_t  ngx_pagesize;
ngx_uint_t  ngx_pagesize_shift;
ngx_uint_t  ngx_cacheline_size;


/*@brief:申请一块尺寸为size的内存块
 *@para:size_t size: 内存块的大小
 *      ngx_log_t *log:日志管理模块
 *@return  value: p 
 */
void * ngx_alloc(size_t size, ngx_log_t *log)
{
    void  *p;

    p = malloc(size);
    if (p == NULL) {
        ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "malloc(%uz) failed", size);
	}
    ngx_log_debug2(NGX_LOG_DEBUG_ALLOC, log, 0, "malloc: %p:%uz", p, size);
    return p;
}

/*@brief:申请一块尺寸为size的内存块,并进行初始化操作
 *@para: size_t size: 
 *       ngx_log_t *log:
 *@return value:
 */
void * ngx_calloc(size_t size, ngx_log_t *log)
{
    void  *p;

    p = ngx_alloc(size, log);

    if (p) {
		//#define  ngx_memzero(x,y)  memset((x),0, (y))
        ngx_memzero(p, size);
    }
    return p;
}


#if (NGX_HAVE_POSIX_MEMALIGN)

/*@brief:申请一块尺寸为size,并字节对齐的内存块
 *@para:size_t  alignment:字节对齐个数
 *      size_t  size:内存块的大小 
 *      ngx_log_t *log: 日志模块
 *@return value:
 */
void * ngx_memalign(size_t alignment, size_t size, ngx_log_t *log)
{
    void  *p;
    int    err;

    err = posix_memalign(&p, alignment, size);

    if (err) {
        ngx_log_error(NGX_LOG_EMERG, log, err, "posix_memalign(%uz, %uz) failed", alignment, size);
        p = NULL;
    }
    ngx_log_debug3(NGX_LOG_DEBUG_ALLOC, log, 0, "posix_memalign: %p:%uz @%uz", p, size, alignment);

    return p;
}

#elif (NGX_HAVE_MEMALIGN)

void * ngx_memalign(size_t alignment, size_t size, ngx_log_t *log)
{
    void  *p;

    p = memalign(alignment, size);
    if (p == NULL) {
        ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,"memalign(%uz, %uz) failed", alignment, size);
    }
    ngx_log_debug3(NGX_LOG_DEBUG_ALLOC, log, 0, "memalign: %p:%uz @%uz", p, size, alignment);

    return p;
}

#endif
